Oil-pump for internal-combustion engines



F. W. SMITH.

OIL PUMP FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED JUNE 5 1920.

Patented Oct. 18, 1921.

2 SHEETSSHEET L F. W; SMITH.

OIL PUMP FOB INTERNAL COMBUSTION ENGINES.

APPLICATION men )UNES. 1920.

1,-394Q042. Patented Oct. 18, 1921i 2 SHEETS-SHEET 2- UNITED STATESPATENT OFFICE.

FRANK WALKER SMITH, OF REDDITCH, ENGLAND, ASSIGNOR 0F ONE-HALF TO THEENFIELD CYCLE COMPANY, LIMITED, OF REDDITCH, ENGLAND.

OIL-PUMP FOR INTERNAL-COMBUSTION ENGINES.

Application filed .Tune 5,

To all whom it may concern:

Be it known that I, FRANK WALKER SMITH, a subject of the Kingdom ofGreat Britain, residing at Enfield Works, Redditch, in the county ofWorcester, England, have invented certain Improvements in or Relating toOil-Pumps for Internal-Combustion Engines, of which the following is aspecification.

This invention comprises certain improvements in or relating to oilpumps for internal-combustion engines. According to the presentinvention the pump cylinder is adapted to oscillate about an axislocated transversely to the axis of the said cylinder, and as a resultof such oscillation the cylinder port is placed alternately incommunication with the ingress and egress ports for the oil. In order toprevent leakage of these ingress and egress ports the pump cylinder isretained in relation to the said ports by a spring.

In order that this invention may be clearly understood and readilycarried into practice, reference may be had to the appended explanatorydrawings, upon which Figure 1 is a part sectional elevation illustratingan embodiment of the present invention.

Fig. 2 is a plan of the parts shown in Fig. 1 with certain elementsremoved.

In a convenient embodiment of the pres- Y ent invention, the pumpcylinder takes the form of a drum-shaped body at having a cylindricalperiphery adapted to enable the said drum-shaped member to oscillatewithin a correspondingly shaped recess or bearing in the frame of theengine. A diametric cylindrical opening 6 is drilled in the saiddrum-shaped member, said cylindrical opening being adapted to functionas the pump cylinder. In this cylinder a plunger 0 is adapted to work,the said plunger being operated by a crank pin (Z driven in anyappropriate manner by or from the timing gear of the engine. This crankpin is adapted to not only reciprocate the plunger 0 within the pumpcylinder, but also to oscillate the drum-shaped member a in which thecylindrical pump chamber is drilled. At right angles to the pump chamberand at the end thereof remote from the crank pin a lateral port 6 isprovided, and as a result of the oscillation of the drum-shaped mem-Specification of Letters Patent.

Patented Oct. 18, 1921. 1920. Serial No. 386,792.

ber this port is placed alternately into register with ingress andegress conduits f, g drilled in the frame or part in relation to whlchthe drum-shaped member oscillates. These ingress and egress conduits areappropriately placed in communication with the supply and deliveryconduits h, 2' for the o1 The drum-shaped member has a fiat face adaptedto bear upon a corresponding flat bearing face provided in that part ofthe engine frame in relation to which the said drum-shaped memberoperates, and the said drum-shaped member is retained in oil-tightrelationship with this stationary face (in which latter the stationaryingress and egress ports f, g are provided) by a spring j advantageouslylocated on the side of the drum-shaped member remote from that on whichthe said bearing face occurs. This spring 7' may, for instance, operatebetween the said drum-shaped member a and a closure plate or member 70which incloses a chamber Z in which the drum-shaped member, the pumpplunger, and the crank pin operate. The spring may be a leaf springhaving a central part; resting upon the drumshaped member, and twoconverging arms extending to the closure member, these converging armsbeing curved at their extremities in. directions away from each other.At a mid-point in the spring the latter may be formed with anindentation adapted to engage with a depression in the drum-shapedmember to thereby locate the spring during the operation of the pump.The drumshaped member a may be formed with a depression whichaccommodates the midpart of the spring.

The chamber Z in which the oscillatory parts of the pump operate mayassume the form of two substantially circular recesses, in one of whichthe drum-shaped member oscillates, and the other of which accommodatesthe crankpin (Z, these two recesses being connected by a narrowerchannel portion which accommodates the pump plunger.

WVhat I claim as my invention and desire to secure by Letters Patent isAn engine frame having a recess including a bearing seat the bottom ofwhich pre sents a flat surface and is provided with inlet and outletports, a drum mounted for oscillation in said seat and on said fiatsurface and having a bore and a port leading from said bore and arrangedto register successively With said port of the frame, a rotary shafthaving a crank pin projecting into said recess, a plunger operated bysaid crank pin and arranged to reciprocate in said bore, a cover forsaid recess, and a spring bearing between said cover and the top of saiddrum and serving to press the latter firmly against said flat surface.

In Witness whereof I have hereunto set my hand.

FRANK- WALKE SMITH.

